Analog Devices Inc./Maxim Integrated MAX6432FJUS

Overview

MAX6432FJUS from Maxim Integrated is a dual-output, factory-trimmed battery monitor IC for single Li+ or multi-cell alkaline/NiMH/NiCd power supplies. It provides two active-low open-drain outputs - LBOH (high-threshold alert) and LBOL (low-threshold shutdown) - with 140ms minimum timeout, ±2.5% threshold accuracy, and 1µA typical supply current. It operates from 1.6V to 5.5V and supports battery-good/weak/empty state indication in portable medical devices and cordless phones.

For engineers reviewing the MAX6432FJUS datasheet, MAX6432FJUS pinout, MAX6432FJUS application, or MAX6432FJUS equivalent, this page delivers verified electrical parameters, SOT143-4 package mapping, dual-threshold timing behavior, and real-world use cases in low-power battery management systems where stable voltage monitoring without external components is required.

Technical Context

The MAX6432FJUS implements two independent comparators with internal hysteresis and a 140ms timeout timer to prevent false triggering during battery recovery transients. Its factory-trimmed thresholds - VHTH− (e.g., 2.6V–3.6V range) and VLTH− (e.g., 1.6V–2.1V or 2.6V–3.1V range) - are fixed at production and require no external resistors. The device asserts LBOH when BATT falls below VHTH− and LBOL when BATT falls below VLTH−, each deasserting only after BATT rises above VHTH+ (≈1.05×VHTH−) or VLTH+ (≈1.05×VLTH−), respectively.

It uses BiCMOS process technology (905 transistors), guarantees valid LBO logic down to BATT = 1.0V, and features immunity to short battery voltage transients. All outputs are open-drain, enabling interface with higher-voltage microcontrollers independent of BATT level - critical for systems using Li+ cells powering 3.3V or 5V logic rails.

Key Specifications

Pinout & Package

MAX6432FJUS is housed in a 4-pin SOT143-4 package (3.0mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant, and optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold battery monitor applications.

Compared with MAX6431FJUS and TLV809E33DBZR, the MAX6432FJUS uniquely delivers dual independent open-drain alerts with factory-set hysteresis - enabling hardware-based, multi-level battery state management without firmware intervention or external components.

Availability

MAX6432FJUS is available at Aetrix Electronics and suitable for portable medical devices, cordless telephony, electronic toys, and handheld scanners requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for MAX6432FJUS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX6427–MAX6438 family was designed specifically for ultra-low-power, precision battery state monitoring in space- and energy-constrained portable electronics - eliminating external components while delivering robust, temperature-stable dual-threshold detection.

FAQ

What is the function of the LBOH and LBOL outputs on the MAX6432FJUS?

The MAX6432FJUS features two independent open-drain outputs: LBOH asserts when battery voltage falls below the factory-trimmed high-threshold (e.g., 2.8V), signaling "weak battery" for low-power mode transition; LBOL asserts at the lower factory-trimmed threshold (e.g., 2.2V), indicating "empty battery" to initiate system shutdown. Both outputs remain asserted for ≥140ms after voltage recovery to ensure stability.

Does the MAX6432FJUS require external resistors to set its thresholds?

No. The MAX6432FJUS uses factory-trimmed internal thresholds - VHTH− and VLTH− - programmed during wafer test. Unlike the MAX6436–MAX6438 series, it requires zero external components for threshold configuration, simplifying PCB layout and improving production yield.

Can the MAX6432FJUS operate with a 1.8V battery?

Yes. The MAX6432FJUS guarantees valid LBO logic down to BATT = 1.0V and operates over 1.6V to 5.5V. Its lowest factory-trimmed VLTH− option is 1.6V, making it compatible with deeply discharged alkaline/NiMH cells and ensuring reliable shutdown signaling even near end-of-life.

What is the timeout behavior of the MAX6432FJUS after battery voltage recovers?

After BATT rises above VHTH+ (≈1.05×VHTH−) or VLTH+ (≈1.05×VLTH−), the MAX6432FJUS enforces a minimum 140ms timeout before deasserting LBOH or LBOL. This prevents oscillation during voltage rebound and ensures the power supply has stabilized before enabling downstream circuitry like DC/DC converters or microprocessors.

Is the MAX6432FJUS pin-compatible with other devices in the MAX6427–MAX6438 family?

No. The MAX6432FJUS uses a 4-pin SOT143-4 package with BATT/LBOH/GND/LBOL pinout. It is not pin-compatible with 3-pin (SOT23-3), 5-pin (SOT23-5), or 6-pin (SOT23-6) variants like MAX6427 or MAX6436. Pin compatibility is limited to same-package members: MAX6430FJUS and MAX6431FJUS share identical pinout and footprint.